# No matter what windows fog up **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** cts, cadillac\ **Created:** [November 22, 2022, 2:24pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544 "2022-11-22T14:24:42Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![rmpitts94](https://avatars.discourse-cdn.com/v4/letter/r/6bbea6/32.png) [@rmpitts94](https://community.cartalk.com/u/rmpitts94)\ **Post date:** [November 22, 2022, 2:24pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/1 "2022-11-22T14:24:42Z")
So my cadillac went from windows fogging up at certain times due to weather conditions to now no matter what the conditions every window is fogged up everytime im in the thing. I am at a loss of what could be causing this. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [November 22, 2022, 2:32pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/2 "2022-11-22T14:32:55Z")
If the air coming out smells sweet, your heater core has a leak. If you’ve had to top off your coolant, that is confirmation. Very bad for your health so get the system pressure tested. There is a drain to let condensation out from the ac coil if that clogs, watrr can build up and cause this. It just needs to be unclogged. Cheap and easy fix. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [November 22, 2022, 2:52pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/3 "2022-11-22T14:52:12Z")
And if neither of those are the problem, check for wet areas on your carpet caused by a leak of some kind, or a plugged drain line for the sunroof or a/c causing water to leak into the passenger compartment. ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [November 22, 2022, 2:55pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/4 "2022-11-22T14:55:54Z")
You may have your hvac system set to “recirculate” rather than fresh air. And, for Pete’s sake, you’ve got a modern automatic hvac system in that car, keep it on at all times. ---
**Author:** ![lion9car](https://avatars.discourse-cdn.com/v4/letter/l/59ef9b/32.png) [@lion9car](https://community.cartalk.com/u/lion9car)\ **Post date:** [November 22, 2022, 3:06pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/5 "2022-11-22T15:06:39Z")
> [@Mustangman](#): > > If the air coming out smells sweet, your heater core has a leak. The film on the window would also be very slimy and hard to clean off, as another clue. ---
**Author:** ![TheWonderful90s](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thewonderful90s/32/29584_2.png) [@TheWonderful90s](https://community.cartalk.com/u/TheWonderful90s)\ **Post date:** [November 22, 2022, 3:46pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/6 "2022-11-22T15:46:45Z")
Maybe something is broken and the air is stuck in recirculate mode. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [November 22, 2022, 4:05pm UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/7 "2022-11-22T16:05:57Z")
Try hanging this inside the car to see if it’s excess moisture in the air or if there’s another problem. ![image](https://global.discourse-cdn.com/cartalk/original/3X/3/e/3e9b643613c3bb4929fbb602462cd8510dcb4b99.jpeg) Tester ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [November 23, 2022, 12:08am UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/8 "2022-11-23T00:08:40Z")
Another idea,ask shop to make sure the AC drain-tube is clear. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [November 23, 2022, 12:53am UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/9 "2022-11-23T00:53:42Z")
Have you verified the ac compressor clutch is engaging? ---
**Author:** ![auto-owner](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@auto-owner](https://community.cartalk.com/u/auto-owner)\ **Post date:** [November 23, 2022, 3:19am UTC](https://community.cartalk.com/t/no-matter-what-windows-fog-up/187544/10 "2022-11-23T03:19:05Z")
Is the cowling in front of the windshield clear?